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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6ae65f10e1e67b1985b7a18a0b9fae757ed6aeb20cf75c4af47d5aee276152e' 
  AND token = '6stfaBSe6WJL3Oy1JwsJ2L9NlsWwbGXQ8T7T/N2Omb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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