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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbb716043b63fc28312919de4420d1010ab1030241d3fc886dab227f8097e146' 
  AND token = 'dBe/nEqDSizY9VMH1hs1mVndoY+JD83PUIdPehaBGus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}