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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e62f6b79abdc8d4e62621a7566c09cc03a029294633e254602ffe69efa47a4c0' 
  AND token = '+w87zBSkbrpacAFp2EjAniofR9KY+yY7oxU5he4xSa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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