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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fa010c12ea0db3f601863fc90450404769d10f7fe93d7ca6a9744aa62d27889' 
  AND token = '3MPVQANEYE/yzCoiwge+TQ1S87HuV5NmbW8nmkbWIrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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