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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e91a5d3858bb68fcda775f308e12c06df802c38c1bb393712c8c150c4a131dc' 
  AND token = 'kN/Lzp2IBGfX3As6yCxwfYYJlIiQns4mo7h5ettk9Ns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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