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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c64ecd5b2405378b31e9532ebd8064af46b04bed7d314f7710fddd25e66860f' 
  AND token = '8FHwXpKYLawELiQzSc41zKUL9JOiPohbGQ9CMbcyP1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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