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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca9fac90af6fcfc6580a92a1b1e2f8b4a7b29895f88c4233aca4ad8deb0070bc' 
  AND token = 'zQEaKc4u/rlHUDjaHAWmWpiZckbzZ4hkG2ZiDl13PhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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