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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91b7304f15879ca43eea0467398fa4b230f799141cd8c7285003e8c48986db30' 
  AND token = 'xRHTz0rUgHp9YcgKYHSKSBCflBKVIa58MALa1I9p5BY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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