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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9f7bc065a74f7e31fb11376c9832e9e0640a4850c5ca64c7055138d2b28548a' 
  AND token = 'Yb8zEDey9QDj4Dvaq3AF5kfyRm8Dh10jDbmEwScui6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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