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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb87117d077bac797916c47ec00391f6d3a702dbb2c20b2aeab23b6f31228a11' 
  AND token = 'P+8sYsodUW/pmj0oW6dqPK1ck3H1Nk3VJXU5k9KLXeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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