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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '803f42291ff2d496be75bfc1d1cf2ae3323b2a9a48ed9f248cb5b710b6ab6511' 
  AND token = 'v5qcAGRthhEUdADc14yvH9vkySBCNXnTccc2Nnt3JKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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