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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bca4d81835ca7280d99abe0159df709cf3aee64b242cb6dba604add4fd40e58' 
  AND token = 'crX011koaZDQhkiGUvRfPXuGCsL9rzga+GxbwSpjZPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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