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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c19e91ab46ff66f0c1e816c4e393851971d5e3ae1692186a149cbf59a16e3089' 
  AND token = 'VX8PbGRwnS5nwLF2s1VHn9s/J2FgcXanxxdfwmEtRro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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