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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bb8a266b6c5308fb8f698ab114c8107f69c09ffd4c6d8cca21ba4310dce0bbf' 
  AND token = 'P6KiRqaBFxlIwsutOThSEDUDgCukKzIl7lCf1rs2phI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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