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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed912d8a1ace05e777dfd20956fbdb1793c5a46dbafa42dd8c494d1c63f6a1ce' 
  AND token = 'rdKflYkDxO6rUmMR3P0iELVptpyU57xFqtjRg/BZq1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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