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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a422fcb7c2fe9d1c4dca148793c507c3f6d798cd63a9d9639a04f3718f838117' 
  AND token = 'KdmSC0E+bf6vh36S5y3YdA8obIJXfABXRQPfFChFNDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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