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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4c8333d763a4c534b7e302986d0ffe16fd1d59cf93d255f0cc791fa90c1a50d' 
  AND token = '2Z19dD2eybVZsvLGW8/SgL1+J3Je46z7zJt0X2aPty8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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