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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5266a06c1a2dc429841bc4a34d5199abce22c6f07271595d3440777f4f427170' 
  AND token = 'u0hT3Wzzi2gM0yh9DQCJP6Zxrd37/f+S5XG6L1RO96Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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