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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f83c9287f0b6d3c6e5900aa14ca164a0a0981e58ce768224d5b412d131647ad7' 
  AND token = 'rsOapw70UXj42z4wJnt3Ukgh/63rH1CDpm2ZP9wd7kc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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