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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce04a69849188a1e9404f8cdff3237d5f57f6378504aa9049011d312398a6fd9' 
  AND token = 'Cl7IoCnri+TCpyfcNAnIwsv4rdu+k2aShx3GfLhppWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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