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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7724f8b16ac24d967a3a3a243ed54e6086dcaa0cff32e411ec3d86b296ce3ffb' 
  AND token = 'i5fusbsNrwx+QxLT2oM1HyJronxfy/LW9DJ6WIPLbIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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