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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb7e77b07350768a78c18a3c2fa07bb82eee18bbf5f9d57d0bec44971ac95f3d' 
  AND token = 'msqXNqaRikTSe3/NrOEglrcty+CpVJWJMC4LbxWgu1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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