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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54cea79d76dd16205a6509ad02457df03087219cd1b84c3764e6ad25c012ca10' 
  AND token = 'muFc6QxICsbZo2Z0+7N73s0SxA+XDRDNtNEx3UYazvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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