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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cc392408be9f4059520d79fe85081f1a388131aeade4668df7cc51458163d51' 
  AND token = 'ahuap4/GCO5xR47bJXDdyXb7Qt5GX246dBVczw3Bm4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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