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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf5e5feda152c6350b659ab5c62c3800fe8414c9c6d2c194cf243d74226726e4' 
  AND token = 'eD8aAV8U5h6fci+cQ1AJebBPjth6+w6XkJFdtaCEx1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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