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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c224eebb0ea8b604593b30f9dd97f6eb3f6fe3efde628e302f8b4aead9ff9d7' 
  AND token = 'eej3Bn3iyxMk1JezIbaKMcayXycIT8tSlP+KR8g5JyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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