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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4aa1310feeacb8061d83c64d5374c8ac3d86dd0ee05c8dd4100770c09a3270a3' 
  AND token = 'TyrPs82DvnBWVSGMr97/FTeqoN0yo2IjlmXBU4smITs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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