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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6169aecf566d54d9ffe9a11b47cfc9afa622eeadd71453dc0c513a67633ef8d1' 
  AND token = 'H66b4Uf+vR/6Xt6MntnOrdJT4cKcIeV0MGslZVGrJA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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