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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7df4abb067fdaf81665ec1e32bb157dc5bd819a261f0060113e7f19fab5ea0ff' 
  AND token = 'vFlCC82n2MD9a2KFsbDte3vvGFA0QX7xRu3OKO2GR+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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