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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3b8a0f604a70b73e750c94059e0bc92b525fab5712daafc8b8093c7ca4514ec' 
  AND token = 'ZSMCsz2W2juTHwmNnAOKkGzeyjGcsqA4JYw5qeXwRKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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