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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cb53ac4c0c2b1a222493eea711d94fc68b11261992e5f7ca76ecbbbfc4187a9' 
  AND token = 'BPJn6OPHZps+zNKlpP3akbVY0ekO+iEGiNbfhzKdV9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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