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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a93ec736c2f87c8269d3bcd068e725c58cb4a5f781642881cbca836ec3d3e791' 
  AND token = 'yq4zml1yg/Mt6ORc37fGJwaE01DyrissyMzJ+Y/Tu/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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