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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abb02d820810e467ac59e1e8d7a74df303045f79112724ea280581866f42af38' 
  AND token = 'A+zTEj4xfeo6XeuOQNn2R3ErLhhSSipep4i3Oo3F9t0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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