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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c393ac1c6b3f9af7f64f28c5827b0fd598758218083f145c16a510d811586ccd' 
  AND token = 'k/5aPFI3LHHn06xR2cB1qbWTrLh5yIC2PfgeWwvH1ZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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