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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5518933cc0b3555d97dc3335e56d3e63ef73de90e50b6f9a45b54681ba634c8' 
  AND token = 'NskX2/Bem00LR2/eMWfXv3yTJyJdw+coTwHWIBwfFEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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