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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd782ac52326fe368c454e4b2b28ea7d3ae7d808f60bc941f4485ba9102c8515d' 
  AND token = '63teHDyTsl2yEiKppqYl+swtGXrXGAO65VzepOwXhiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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