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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48e87f2fae4020e7d20bd2e193c450da6f1080f864f26a7890d3a67fe4b590ce' 
  AND token = 'EkvE96ECPAI9k9mmKHNV6dEcfne4v4mMFJvA1G7l8NM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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