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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6344bbf3f6c8325367b0ebf0fb1d6a5fe1fc0d3933151834a98be288a10f8619' 
  AND token = 'LEnx3rwcgPsWksRoG2PzaFJ50VP+Oe4pps12gxZYDqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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