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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58d9ed4a562de855ed4c5d497b985286c43d80251f2de9f9948e9f9d2528dbc8' 
  AND token = 'p9S6HS//YCcuoDr2vJUwPUYO4/QHbn97KqkVm4AuBaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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