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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ea25cd0c596f18c4e193a0d0a0283dffb5cecb3b0449629c348f0d3d8b8e435' 
  AND token = 'iD4E2eQgvU3DAVPWjHoYatsDvs8U3MtL+IMmfcfSoX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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