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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c97c063efebf56fbc4caa9325eb50cebc467bd87abd7b22d0997d4d378e49f61' 
  AND token = 'Wgw1YrX/2imnOAoL93msfA8C+Rgju6pCe8FicSt4NlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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