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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70764ef8d38c4e58a42fedffea08ab9b97f3ce8a059c8b1c6584d13037de2f1e' 
  AND token = '4+CfCj75PEro3xDnLwV49TDAKA72+5Dn4q9vtSGH3Jk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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