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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a69f98f0081a186ff7e5f4a985168efd6daa1aa0daa81e5f9b9a4ae9f6f172d1' 
  AND token = 'tAb2m2WioGt8f6CNEdPjecp7IgAOaMIh9MFSoC/qBzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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