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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abd6e31191890091311bdcd9352fe1935d3b193c8f28ae049133231630801eed' 
  AND token = 'ua+ftbFQtfMU/nPvLa2Eh1knqzcY2nBl+QhImlDH32o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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