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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0548e5c977c75b3359bbb4c95aef7bc47a2b74a7122846c81a7e5be47f7cf523' 
  AND token = 'mN8CcohPeua4CFIEqT4Co8usOuNe3w70XH0W3eM4HSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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