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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfafff993202f3794d2a3b463f4576ac41bc1fbde3f59cf3cc5704d480879648' 
  AND token = 'd5/VIORvPhc1aP2McAZLOVoVDvI1WRMN44ynUVyQuCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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