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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51efe85b4cfb6560789e5c07ec11b43b777ec12890ca968019a2331f9b3827dc' 
  AND token = 'SJiHFWZc81UooQCwQf9C3C7SCrknNWf/wkxSNPRBwps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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