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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed31097130fef6992b1587755a1cd03a725a7e87cbe344f3a1047af0d89b7c13' 
  AND token = 'KhXO0J11wzYFdB07APt9ld0f5CJbeBjD+oHDSftsAto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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