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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56d1e3e0813de5bff774066ebc24ac77d25a94ed367e0b08d64ed5d2e1139728' 
  AND token = 'z8GMGdwaspCa+HNAqSlcuc5rASvxQo1E2M/7/iWdnto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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