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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9942d29b5d947c311f0e7fc3a237c8aaa1a79c0864a9b486916ebef8fad1a741' 
  AND token = 'uvXE4jQy2gYgfxl0BZ3Fp4Vwj1B3hZNkPN0wCcY5w48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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