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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7312ee3215e6cd76df4b3d04836ecd1a57154778500052dff163b0d0d9c7f4c3' 
  AND token = 'zhnYWycPzvQpKBvC7vNEOx22/pBbgEOoNsw8wAtA6R0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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