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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a16c1c62faed8e3a9679a941b33b6093fcaad34a598d91f48fed7d9e4c3d4bcc' 
  AND token = '1vU7thRLP0y/hra3HnkH/x1BxvtAK0gRr1LQztaCwA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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