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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5aa485b457352b2bfdb812a927861d8ccfedbe2dfcc4a75d46baefb9b00a07d9' 
  AND token = 'HyoXARn2XC3yWOwDT/qjzL1z0BVj9aINruabKRHSn5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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