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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7760388186fcdca90ea9cf7839441b862acfa027da51492917b16c5dfb27afa7' 
  AND token = 'ib0QKW5z9oJu2Q0PXfM8K+3SmaWm00TNZ90AP2B5J84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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