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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e9b5f8947be4f64ea7d031b23855af34e37300e38e431a654d60a526838c511' 
  AND token = 'GkvX4c7zfhac6m0GQxgRfQjySIEczMl0147Lx2u3TUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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