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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb77118bb51fc335fc0f5c26a055c79390f23632114e528e445fdd526fdabacd' 
  AND token = '3cCEz9vLN/ykbPyoNEMrF6kLJ2nPGNnZkNQwEh7KnW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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