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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4f472ed9894762e746de2c15c60b630de49be9f078d0e57c522e4b0aba3d980' 
  AND token = 'FBHhN0FArpU4koJzUlQwylonGlIknNJrlr6xnbj4rA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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