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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92bc835ef1d34350e227a12dece40b088eea3c9a021f371ac360491d90517ca8' 
  AND token = 'ELFXhy7s1e3JLEuHJKSjG6X0fN7btPjqkhWbLyqMbdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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