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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0942f36fbd576bef0c9d7ae7a8ecb5de1c1f7a751f647f90df45303ec69843a' 
  AND token = 'wEzI5145P4fV3AtAIVsujyXYhJDiH2eoR96s1Lb5oMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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