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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f088df6ae60a85c8874796b36f7e86e628f64c3b1e1c17b77a537b198357b50' 
  AND token = 'IBadofWPCiAvohth44YjtN2aQwyb+1z1wIVypqOlJAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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