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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc76f31ea109b9bacf657639d5136b854763a2ff53c3155a2c56b232fe7bf60c' 
  AND token = 'zMrm/ODJ0yl6FG3t3GfY/tkNpCflddPtRzmAAZtHHzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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