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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aaae9050ff5fd04469df043a82342ddff497d743fe97e860d3c64becf02660a0' 
  AND token = '3Y998hVGnIcTAVoqS+yHd3RQnRJAInTeaDRcfEFeFNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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