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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f56d71783bb58ae0e79ec55c3410d8ba3a84635cc4c4c15e1a592c80ebc09408' 
  AND token = 'V1haV06fAX/ksofzwcwC4dnT7e4s+2nI7t1RMuIfWhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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