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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb1e4a4c29e8b350ec066fb6944393476712aaa909c09584a2015183f115196a' 
  AND token = '2Gp+VhXUNnO93uu9pmvwoc05GS90J3T8uC0hNinCXTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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