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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57dfae66d0e43ab8c2454eab7e595495f5b05d46edb7302df76ef8076c053a08' 
  AND token = 'qFpm7gX3i3eqkx9xyTJ5PSxFMsnlnn0BVe3VGFggD1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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