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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9717e37f7f65982b57a38a7937a86cd4ed9b0a27da9c6b60267b9616d1954182' 
  AND token = 'qBumPdfcriAi/4NbNGHviKfEokGonnYKBggDreA+NO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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