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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3d08232f53c541f37c2e9fd1f584b6b7165cf69c8d24fda0a538252ff1c0415' 
  AND token = 'KO8X1oRPct9kAPz9qFnkGvmh1tnstR/8h+3NjNesTb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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